ted.library/TEDGetLabelList
   NAME
       TEDGetLabelList -- obtain the address of the label-list

   SYNOPSIS
       address = TEDGetLabelList()
       D0

   FUNCTION
       Returns the address of the label-list

   RESULT
       address -- address of the label-list (0 for failure)

   NOTES
       The label-list is constructed as follows :

            *NextLabel
            *LabelText

       where LabelText :
            *PrevLine
            *NextLine
            linelength.b
            <actual tokenised text>